Docstoc

Product Sheet

Document Sample
Product Sheet Powered By Docstoc
					Product Sheet
Silicone Primers
Priming of surfaces to achieve improved adhesion has been employed in industry for many years and is of particular importance in the use of silicone adhesive sealants and 2-part RTV silicone rubbers. Silicone adhesives and some 2-Part rubbers have built in adhesion promoters; with these products the use of a primer will only be required for use with substrates that are exceptionally difficult to bond to. Most 2-Part silicone rubbers will not have any adhesive qualities and the use of a primer will be essential if adhesion is required (see individual product data sheets). Due to the large variety of substrates any recommendations regarding adhesion and the use of primers can only be taken as a guide, we always recommend thorough testing for adhesion of any system prior to production. Silicone primers are normally supplied in the form of quick drying solvent solutions and are available in bottle or can packages. A good primer must have certain properties and sometimes, perform several functions: • • • • It must be easy to apply It must dry quickly to a uniform dry film (say in less than 30 minutes) The improvement in adhesion must be demonstrable Adhesion to the substrate should not be affected over the temperature range of the rubber

Application Methods
It is essential that a uniform, thin coating of the selected primer is applied and allowed to dry completely before bring it into contact with the silicone elastomer system. All silicone primers are supplied as solutions in a wide variety of organic solvents. Some of these solvents present a greater hazard to the user than others. Full details of the solvents and any other potentially hazardous components are given in the individual product Material Safety Data Sheets, available on request. NOTE: Always handle primers in well-ventilated areas away from any potential sources of ignition. 1. 2. 3. 4. 5. 6. 7. 8. Select the primer of choice or contact ACC Silicones for advice on the best primer for a specific application. Degrease all surfaces to which the primer and silicone rubber are to be applied. Care should be taken to avoid high boiling point solvent fractions, which often leave undesirable residues. Allow the surface to dry or wipe dry with a clean, felt-free rag. If applying by brush, apply sparingly and clean brushes in a suitable solvent after use. Apply primer to the degreased dry surface to be bonded using single light applications. If possible, avoid multiple applications – a thin uniform film of primer is more effective. After sufficient surface coverage has been achieved, close the primer container. Leave primed articles to dry and cure for between 20 and 60 minutes depending on ambient temperature conditions (the use of elevated temperatures is not recommended). See product data for details.
01/10/09 Page 1 of 3 www.acc-silicones.com

Silicone Primer Product Sheet Revision No3

9.

Apply adhesive as soon as possible after the primer has dried. Some primers will continue to react with moisture in the atmosphere and will loose their ability to chemically bond to the adhesive if left for more than 24 hrs.

10. If using a one-component silicone sealant, apply it to one primed surface and immediately bring the other primed (or un-primed if desired) surface into contact. Apply gentle pressure to attain intimate contact, whilst leaving sufficient sealant (normally a minimum of 1mm) to produce a good joint. 10. If, for example, adhesion between two substrates employs a 2-part silicone rubber, catalyse and degas the chosen rubber during the primer drying cycle and then pour the rubber in the normal manner.

ACC Silicones Primers
The list below details many of the standard ACC Silicones encapsulants. Before selecting a material careful consideration should be given to the relevant Technical Data Sheet. Name Silcoset Primer Type Resin based For use with 1&2-Part condensation cure RTV’s Recommended Substrates • Most metals • Glass • Plastics • Composites • Silicone elastomers • Pastics • Natural & synthetic rubber • Polyester • Nylon fabrics • Most metals • Natural & synthetic rubber • Polyester • Nylon fabrics • Non-porous surfaces • Most metals • Backing plates for print pads • Wood • Aluminium

OP2N

Resin based

1-Part condensation cure RTV’s

No 3

Silicone based

1&2-Part addition cure silicone rubbers.

No 6 Tampo Pad Primer

Silicone based Silicone based

1-Part condensation cure RTV’s 2-Part Addition cure silicone rubber

NOTES (RTV) stands for Room Temperature Vulcanising silicone rubbers. Primer No 3 has also been found to act as a barrier to substrates that usually cause inhibition to platinum or addition cure systems.

Silicone Primer Product Sheet Revision No3

01/10/09

Page 2 of 3

www.acc-silicones.com

Substrate Adhesion Guide
The following chart provides information regarding the adhesion of silicones to most common substrates. First select your substrate and then the type of adhesive or encapsulant being used. The Chart below will show the level of adhesion expected without primer and which primer to use if the result is less than excellent. If the adhesion is graded as good this will probably be sufficient in most cases but should you wish to improve adhesion then follow the recommendation. Please note this is a general guide to help in the selection process and cannot take into account all product and substrate variations. Customers should always conduct their own adhesion test.
1-Part Adhesive Sealants
Acetoxy Cure Oxime Cure Primerless Good Good Primer OP2NN No 6 Do not use Do not use N/A Do not use OP2N N/A N/A N/A No 6 No 6 No 4 OP2N OP2N OP2N OP2N OP2N No Bond N/A OP2N N/A OP2N OP2N N/A N/A No 6 OP2N OP2N Do not use Alkoxy/Methoxy Cure Primerless Good Fair Excellent Excellent Excellent Excellent Good Excellent Good Excellent Good Good Good Good Fair Good Good Good No Bond Good Good Good Good Good Excellent Good Good Good Good Good Good Primer OP2NN No 6 N/A N/A N/A N/A OP2N N/A OP2N N/A No 6 No 6 No.4 OP2N OP2N OP2N None OP2N No Bond OP2N OP2N N/A OP2N OP2N N/A No 6 No 6 OP2N OP2N Do not use Acetone Addition Heat Cured Primer No 3 No 3 No 3 No 3 No 3 No 3 No 3 No 3 No 3 No 3 No 3 None No 3 No 3 No 3 No 3 No 3 No 3 No 3 No 3 No 3 No 3 No 3 N/A No 3 No 3 No 3 No 3

2-Part Potting & Encapsulation
2-Part Platinum Addition Primer No 3 No 3 No 3 No 3 No 3 No 3 No 3 No 3 No 3 None No 3 No 3 None No 3 No 3 No 3 No 3 No 3 No Bond No 3 No 3 No 3 No 3 No 3 No 3 None No 3 No 3 No 3 No 3 No bond Do not use 2-Part Tin Condensation Primer Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer None Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer No Bond Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer None Silcoset Primer Silcoset Primer Silcoset Primer Silcoset Primer No Bond Do not use

Subsrtate
ABS Aluminium Brass Bronze Ceramic tiles Copper Corona treated Polypropylene Fibreglass Fluoroplastics Glass Iron Lead Masonry (Porous) Neoprene Nylon Perspex Polycarbonate Polyester Polyethylene Polystyrene Polysulphide Polyurethane Printed Circuit Boards PVC PVF Silicone Stainless steel Steel Synthetic rubbers (Butyl) Synthetic rubbers (SBR, Nitrile, EPDM) Untreated wood Varnished wood

Primerless Fair Good

Primer OP2N No 6

Primerless Primer Primerless Good Excellent Excellent Excellent Excellent Excellent Good Excellent Good Excellent Good Good Good Good Excellent Fair Good OP2N N/A N/A N/A N/A No 6 OP2N N/A OP2N N/A No 6 No 6 No 4 OP2N N/A OP2N OP2N Do not use >150 C >150°C >150°C >150°C >150°C >150°C Do not use >150°C >150°C >150°C >150°C Do not use Do not use Do not use >150°C >150°C Do not use Do not use >150°C Do not use Do not use >90 >150°C >150°C Do not use Do not use
o

Do not use Do not use Do not use Do not use Do not use Do not use Excellent Good Excellent Fair Excellent N/A OP2N N/A OP2N N/A Excellent Good Excellent Excellent Excellent Good Good Good Good Good Good Good Good No Bond Excellent Good Excellent Good Good Excellent Excellent Good Good Good Good Good Do not use Do not use Do not use

Do not use Do not use

Do not use Do not use Do not use Do not use Do not use Do not use Fair Fair Fair Fair Fair No Bond Good Fair Fair Do not use Fair Fair Excellent Good Do not use Fair Fair Good Fair OP2N OP2N OP2N OP2N OP2N No Bond Do not use OP2N OP2N None OP2N OP2N N/A No 6 None OP2N OP2N Do not use

Do not use Do not use 145°C Max

No Bond No Bond Do not use Do not use Good Good Good Good Good Excellent Excellent Good Good Good Good Good OP2N OP2N OP2N OP2N OP2N N/A N/A No 6 OP2N OP2N

Do not use No Bond No Bond

Not advisable Not advisable Excellent

Do not use Do not use Do not use Do not use Do not use

Silicone Primer Product Sheet Revision No1

1/11/07

Page 3 of 3

www.acc-silicones.com


				
DOCUMENT INFO
Shared By:
Tags: Product, Sheet
Stats:
views:146
posted:1/22/2010
language:English
pages:3
Description: Product Sheet